
Weekly year-over-year percent change and week-to-week percent change through Dec. 24, 2011.*Intermodal CargoU.S. railroad intermodal traffic for week 18 of 2012, ending May 5, grew 3 percent year-over-year. Year-to-date total intermodal units, at 4,114,427 units, were up 2.8 percent from the same period last year.Trailer CargoRailroad trailer traffic for